JP2008523296A - Heat exchange device for gas containing acid - Google Patents

Abstract

An apparatus for exchanging heat between an acid-containing gas and a heat exchange medium having at least one flow passage for the acid-containing gas, in particular simple and / or inexpensive in terms of its formation. Constitute.
To an internal combustion engine having a supercharged air cooler with an intake conduit, a compression member, a supercharged air conduit, and at least one flow passage for supercharged air disposed in the supercharged air conduit. Supply combustion air. Combustion air in the intake conduit or in the supercharged air conduit can be mixed with exhaust gas from the exhaust gas recirculation conduit and then guided through the supercharged air cooler. At least one flow passage of the supercharged air cooler consists essentially of aluminum and / or aluminum alloy.
[Selection] Figure 2

Description

  The present invention relates to an apparatus for exchanging heat between an acid-containing gas and a heat exchange medium having at least one flow passage for the acid-containing gas. The present invention further comprises a supercharged air cooler comprising an intake conduit, a compression member, a supercharged air conduit, and at least one flow passage for the supercharged air disposed in the supercharged air conduit, The present invention relates to an apparatus for supplying combustion air to an internal combustion engine. In that case, the combustion air in the intake pipe or between the supercharged air can be mixed with the exhaust gas from the exhaust gas recirculation conduit and then guided through the supercharged air cooler.

  In a device of this kind, for example, in an air-cooled or coolant-cooled system, in particular in a supercharged air cooler that is flowed by exhaust gas that is recirculated in the case of low-pressure exhaust gas recirculation in a diesel engine, for example, the dew point of the substance containing the gas As a result of the relatively low temperature below, corrosion problems occur in the supercharged air cooler. This is because, for example, sulfate exhaust gas condensate and, in some cases, chloride from the intake air collects. The supercharged air cooler for this application case is usually formed from stainless steel for this reason.

  In this situation, the object of the present invention is to exchange heat between an acid-containing gas and a heat exchange medium having at least one flow passage for the acid-containing gas (ie, an acid-containing gas). Device), and in particular with respect to its formation, it is simple and / or inexpensive. In particular, it seeks to protect the major components, such as pipes, pipe bottoms, air cases, etc., of heat transfer bodies, in particular supercharged air coolers, from deep corrosion due to acids containing gases.

  An object of the present invention is characterized in that the device having the features of claims 1 and 2 (i.e. at least one flow passage of the supercharged air cooler consists essentially of aluminum and / or an aluminum alloy). An apparatus for supplying combustion air to an internal combustion engine or an apparatus for exchanging heat, characterized in that at least one flow passage for the gas containing acid consists essentially of aluminum and / or an aluminum alloy) Is done.

BEST MODE FOR CARRYING OUT THE INVENTION

  According to the invention, the device for exchanging heat has at least one, preferably two or more flow passages for the acid-containing gas, the flow passages being substantially made of aluminum or an aluminum alloy. Become.

  The gas containing an acid in the gist of the present invention is intentionally or unintentionally added with solid and / or liquid additives having a pH value of less than 7, especially less than 5, in itself or in an aqueous solution. Gas. Examples of acids containing acids are supercharged air for internal combustion engines, especially after mixing with exhaust gases containing sulfur oxide or sulfuric acid, or refluxed exhaust gases of internal combustion engines, in particular diesel engines.

  According to the invention, the device for supplying combustion air to an internal combustion engine has an intake conduit for air containing oxygen, in particular ambient air, a compression member such as a turbocharger and a supercharged air conduit. Arranged in the supercharged air conduit is a supercharged air cooler having at least one, preferably two or more flow passages for the supercharged air. The exhaust gas recirculation conduit opens into the intake conduit before the supercharged air cooler or into the supercharged air conduit so that the combustion air can be mixed with the exhaust gas and the mixture is guided through the supercharged air cooler can do. The one or more flow passages for the supercharged air are substantially made of aluminum or an aluminum alloy.

  In order to prevent or delay the destruction of the one or more flow passages based on the acid content of the gas, the one or more flow passages preferably have a corrosion protection. Preferably, the corrosion protection is formed as a coating, plating, in particular solder plating, turbulent inserts and / or fins. Preferably, the inside of the flow passage is completely covered by the corrosion prevention part. In some cases, however, a coating that is incomplete and sometimes associated with labor savings, for example based on cracks, holes or gaps in the coating or plating, is also sufficient.

  According to an embodiment, the corrosion protection part has an area that is susceptible to electrochemical oxidation, which area has a cathode corrosion prevention part for the area to be protected, for example of the core material of the flow passage. is doing. The area to be protected in that case does not necessarily have to be completely covered with a material that is susceptible to oxidation, but rather a partial area that is susceptible to oxidation, for example in the form of an insert, in particular a turbulent insert or fin. Similarly, a coating is necessary only in areas where it comes into contact with corrosive gases, in which case a partially planar coating is particularly sufficient. In particular, the individual parts are hard soldered together. Soldering can be carried out with or without a flux, in particular under vacuum or protective gas.

  Based on the electrochemical potential difference between the area to be protected and the more easily oxidized corrosion prevention part, the corrosion prevention part will oxidize or corrode, but the less protected area will be oxidized. It does not corrode. Therefore, the corrosion prevention part is used as a sacrificial anode. Preferably, the corrosion preventing unit raises the pH value of the gas containing the acid or the acidic medium contained therein by the oxidation.

  The electrochemical potential difference between the area to be protected and the oxidizable area of the corrosion prevention part is preferably at least 20 mV, in particular at least 50 mV. Particularly preferred protection is given when the potential difference is at least 100 mV.

  In order to ensure good corrosion protection of the area to be protected, at least the area in contact with the corrosive medium is coated with a base metal, an easily oxidizable phase or an easily oxidizable alloy. Alternatively (or in addition), this surface is connected in electrical communication with this type of oxidizable region.

  The core material of the flow channel is preferably from an aluminum alloy in the row AA3xxx, in particular from AA3003 or AA3005, or from a general transformation in a heat transfer structure, and / or from pure aluminum (AA1xxx), in particular from AA1145 or AA1050, or From a general transformation in the heat transfer structure and / or from an aluminum alloy containing copper in row AA2xxx, or from a transformation common in the heat transfer structure and / or from an aluminum alloy in row AA6xxx, in particular from AA6063, Or because of the transformations common in heat transfer structures, especially in the case of welded pipes or other welded components, an increased copper content (> 0.5% by weight) is desirable. In the case of an extruded pipe, the pipe preferably consists of an AA3xxx aluminum alloy or a transformation common in heat transfer structures, or from AA1xxx pure aluminum or a transformation typical in heat transfer structures.

  Zinc is preferably provided as the metal that is easily oxidized. In the case of oxidizable alloys or phases, these preferably have a content of zinc, tin, indium and / or vanadium.

  According to a preferred embodiment, the turbulence inserts / fins are first corroded because there are provided turbulence inserts and / or fins in the flow passage, which on the one hand improve the efficiency and on the other hand are used as sacrificial anodes. Then, the core material is corroded.

  In a preferred embodiment, the flow passage and the insert / fin are not plated, in which case the insert / fin forms a corrosion protection. In a preferred variant, the flow passage and / or the insert piece / fin are provided with solder plating on either or both so that the flow passage and the insert piece / fin can be soldered together. In a preferred form, a corrosion protection, formed as a plating, is provided for the flow path and / or for the insert / fin.

  According to a preferred form, the flow passage is a four-layer or five-layer structure consisting of the core material, the inside and outside of the solder plating and particularly preferably the inside and / or outside of the corrosion protection layer arranged under the solder plating. have.

  According to a variant, the flow passage has only one anticorrosion layer on the inside and has solder-plated turbulent inserts and / or fins.

  The turbulent inserts and / or fins—with respect to the core region to be protected—are preferably made of a material that is susceptible to oxidation or is covered with a base metal, a phase that is easily oxidized or a metal that is easily oxidized. That is, for example, a turbulent insertion piece containing zinc is preferable.

  The turbulent inserts and / or fins may be from one of the aluminum alloys described above for the flow path, in particular from AA3xxx with or without zinc, or from transformations common in heat transfer structures, or in rows AA7xxx. From an aluminum alloy, in particular AlZn1, or from a transformation common in heat transfer structures, or from row AA8xxx, in particular from AA8006, AA8011, or AA8079, or from transformations common in heat transfer structures.

  Preferably, an AlSi solder plating is provided, in which case the plating has an element that is easily oxidized, and the silicon content of the solder plating is in the range of 4 to 15% by weight, in particular 5 to 12% by weight. The zinc content is in the region of 0.05 to 10% by weight, in particular 0.2 to 5% by weight, and the indium, tin and / or vanadium content is in the region of 0.0 to 0.3% by weight. It is in. The element that is easily oxidized is preferably zinc and / or indium.

  The thickness of the plating is as constant as possible and is 2 to 40%, in particular 2 to 30%, in particular 5 to 20% of the thickness of the core material, especially at its thinnest part.

  Preferably, a multi-layer plating is provided, in which case a protective plate under the AlSi solder plating is somewhat less likely to oxidize or is more likely to oxidize than an AlSi solder plating that is more susceptible to oxidation than the area to be protected. Is provided.

  The device according to the invention is preferably hard soldered using a zinc-containing flux, in which case the zinc-containing flux forms a zinc-containing surface in the bonding region, which is optionally Is used as a sacrificial anode (additional or single).

  Hereinafter, the present invention will be described in detail using a plurality of embodiments with reference to the drawings.

  FIG. 1 shows a system 10 with low-pressure exhaust gas recirculation as an example of an apparatus according to the invention for supplying combustion air to an internal combustion engine M. The low pressure side conduit is indicated by a solid line, and the high pressure side conduit is indicated by a broken line. Each flow direction is indicated by an arrow.

  FIG. 1 shows an example of low-pressure exhaust gas recirculation, in which the exhaust gas containing the acid to be recirculated from the exhaust gas stream coming from the engine M is branched on the low-pressure side, and therefore after the pressure drop. The exhaust gas is fed to the intake conduit 30 through an exhaust gas recirculation conduit 40, in which the exhaust gas cooler 20 is preferably disposed, where it is mixed with the acid-free ambient air. A mixture containing acid is sucked in by a compressor V, preferably an exhaust gas turbocharger, and is fed into the supercharged air conduit 50 as compressed supercharged air.

  The supercharged air is cooled by the supercharged air cooler L arranged in the supercharged air conduit, and then supplied to the engine M. In that case, the supercharged air cooler L has, according to the invention, a plurality of flow passages for the supercharged air, which flow passages are substantially made of aluminum or an aluminum alloy.

  In a similar embodiment, not shown, the exhaust gas recirculation conduit is arranged on the high pressure side and therefore branches off from the exhaust gas conduit between the engine and the turbine of the exhaust gas turbocharger, and the compressor and the supercharged air cooler. Between them into the supercharged air conduit.

  FIG. 2 shows a partially exploded perspective view of a heat exchanger according to the invention, for example used as an exhaust gas cooler or a supercharged air cooler. Reference numerals 1a and 1b preferably relate to a supply and discharge for a liquid coolant. This coolant is preferably water from the coolant circulation, in particular water with additive substances such as glycols. However, other coolants can be provided both in the gaseous phase and in the liquid phase.

  Reference numerals 3 and 4 relate to a supply part and a discharge part of an acid-containing gas, for example, exhaust gas or supercharged air. The supply part and the discharge part are formed in the shape of an inflow flange or an outflow flange, and can be connected to other supply pipes, respectively. These connections can be made by inserting a pipe with a larger peripheral surface onto the flange or by inserting a pipe with a smaller peripheral surface into the opening. Preferably, each flange is provided with a ridge 9, which allows a more stable connection between the supply pipe and the flange.

  Reference numeral 6 relates to a housing for a device for exchanging heat. The supply part and the discharge part for the coolant, the supply part and the discharge part for the gas containing acid, the cover device 5 and the cover device opposite thereto are not constituent parts of the housing.

  According to an embodiment, there is provided an exhaust gas cooler consisting of an air case, a pipe and a bottom, each formed from an AA3003 aluminum alloy. In that case, the AlSi solder plating, which is as flat as possible (but not necessarily completely connected), on the pipe and bottom, in contact with the exhaust gas, is here about 8-12% by weight of silicon. It has a content and zinc, in which case the zinc content is provided here at about 2-4% by weight. In addition, AlSi solder plating contains minor amounts of indium, tin and vanadium (<0.3 wt% each) and minor proportions of other impurities. The plate thickness here is 5-15% of the pipe wall thickness.

  According to the modification, the same AlSi solder plating is provided also in the area of the air case that comes into contact with the exhaust gas.

  Inside the exhaust gas cooler, there are provided turbulent inserts or fins for improving the efficiency of the cooler, which according to the first embodiment have a solder plating corresponding to the pipe and bottom solder plating. Made of pure aluminum (although in line AA1145).

  Based on the electrochemical potential difference (above 100 mV here) between the less oxidizable core region and the oxidizable coating * (solder plating), the oxidizable coating (especially the zinc component) will oxidize or corrode. . This has the effect that the corrosion takes place planarly, in particular deep, i.e. no pore or intercrystalline corrosion takes place. In that case, as an additional side effect, in some cases, the hydrogen ions present are reduced, so that the pH value of the exhaust gas condensate moves to a higher value which is not critical.

  According to another embodiment, there is provided an exhaust gas cooler with a turbulent insert of an AA7xxx series, here made of an aluminum alloy of AlZn1, which is more susceptible to oxidation than the components to be protected of the exhaust gas cooler, The turbulent insert will corrode.

  As another example, an exhaust gas cooler is provided having a zinc-free AA3003 aluminum alloy as the core region (air case, pipe and bottom). A layer made of AA3003 aluminum alloy with zinc (about 5% of the pipe wall thickness) is provided thereon, and further, a layer of the AlSi solder plating type (10% of the pipe wall thickness) is provided thereon. . In that case, the layers are provided in particular connected both in the region in contact with the exhaust gas and in the remaining region.

  According to the modified example, the layer is provided only in the partial region in contact with the exhaust gas, and in this case, the layer does not necessarily have to be formed continuously.

  According to another embodiment, there is provided a heat transfer body with MPE ("multi-port extension") pipe, particularly made of AA1050 pure aluminum, which adjusts the appropriate zinc diffusion profile when soldering. For this purpose, it is soldered with a flux containing zinc, so that a zinc rich surface is provided in the soldered area of the air case / pipe / bottom / fin. In that case, the heat exchanger has, according to embodiments, turbulence inserts inside some or all of the pipes. According to a variant, the heat exchanger is formed without turbulent inserts.

  Each of the coatings and platings described above is preferably already provided on the respective base material or semi-finished product prior to forming the device. However, it is equally possible to provide them inside the flow passage after their formation. In both cases, it is particularly preferable to provide a corrosion prevention part in combination with an organic or inorganic binder, so that the corrosion prevention part is chemically or physically inside each flow path at least before the soldering process. It is arranged in a matrix that has been cured.

  All example pipes are preferably extruded, folded from sheet, soldered and / or welded. Besides the pipe bundling method described above, a suitable form of the device for guiding the gas differently, for example in a packet structure, a disk structure or a stack disk structure, is possible as well.

The following dimensions are particularly effective: Indirect exhaust gas heat exchanger In an indirect exhaust gas heat exchanger, hot gas is cooled by a coolant, in particular a liquid coolant such as water or other liquids. The coolant is also cooled in other heat exchangers, particularly in a coolant cooler. The coolant is preferably cooled by air in a coolant cooler.

Direct exhaust gas heat exchanger In a direct exhaust gas heat exchanger, the hot gas is directly cooled by a coolant, in particular a gaseous coolant, for example air.

  “Passage height exhaust gas” is in particular the height of the flow passage through which exhaust gas flows through the exhaust gas heat exchanger.

  The “passage height coolant” is in particular the height of the flow passage through which the coolant flows through the exhaust gas heat exchanger.

  “Flow length coolant” is in particular the length of the flow distance through which the coolant flows in the exhaust gas heat exchanger, in particular the total length of the exhaust gas heat exchanger.

The “flow length exhaust gas” is, in particular, the length of the flow distance through which the exhaust gas flows in the exhaust gas heat exchanger, in particular the total length of the exhaust gas heat exchanger.

  “Pipe wall thickness exhaust gas” is, in particular, the thickness of the pipe wall of the pipe through which exhaust gas flows in the exhaust gas heat exchanger.

  “Pipe width exhaust gas” is, in particular, the width of the pipe through which the exhaust gas flows through the exhaust gas heat exchanger.

  “Fin density coolant” is a member that generates turbulent flow, particularly raised, winglet, raised or engraved turbulent inserts inserted into the coolant passage / coolant pipe. Of decimeters per length.

  “Fin thickness coolant” is the thickness of the material of a member that generates a turbulent flow, particularly a turbulent flow insert, especially inserted into a pipe or passage, through which the coolant flows.

  “Fin thickness exhaust gas” is the thickness of the material of a member that generates a turbulent flow, such as a turbulent flow insert piece, in particular, which is inserted into a pipe or passage and through which the exhaust gas flows.

  “Passage height exhaust gas: passage height coolant” is, in particular, the ratio of the height of the passage through which exhaust gas flows to the height of the passage through which coolant flows.

  “Vertical Pitch Fin Coolant” generates turbulent flow adjacent to it, especially in the turbulent flow, in particular in the pipes and / or turbulent inserts, or in the flow direction of the coolant. It is the space | interval between the members made to make.

  “Longitudinal pitch winglet or longitudinal pitch winglet exhaust gas” refers in particular to a turbulent flow component, in particular pipes and / or turbulent inserts, or adjacent to it, particularly in the direction of exhaust gas flow. It is an interval between members that generate turbulent flow.

  The “winglet angle” is in particular adjacent to, and substantially perpendicular to the flow direction of the exhaust gas, in particular the bulges or imprints of the members generating turbulence, in particular pipes and / or turbulence inserts. The angle between the turbulent members and the members arranged in the same manner.

  “Winglet offset overshell vs. undershell” means substantially opposing pipes, in particular bulges or imprints of pipes and / or turbulence inserts, especially in the direction of exhaust gas flow. This is the distance to the member that generates the turbulent flow that is disposed closest to the side or passage side.

  “Winglet height [%] relative to passage height” means the bulging or imprinting of a member that generates turbulent flow, particularly pipes and / or turbulent inserts, relative to the height of the passage through which coolant or exhaust gas flows. Is multiplied by a factor of 100.

  “Winglet length: Winglet height” is the ratio of the length to the height of the member that generates turbulence, in particular the pipe and / or the turbulent insert.

  The “passage height cooling air” is in particular the height of the flow passage through which the cooling air flows through the exhaust gas heat exchanger.

  The “flow length cooling air” is in particular the length of the flow distance through which the cooling air flows in the exhaust gas heat exchanger, in particular the total length of the exhaust gas heat exchanger.

  “Fin density cooling air” is a member that generates turbulent flow, particularly raised, engraved or engraved in a coolant passage / coolant pipe, such as lifts, winglets, and turbulent inserts Of decimeters per length.

  “Fin thickness cooling air” is the thickness of the material of a member that generates a turbulent flow, such as a turbulent flow insert, especially inserted into a pipe or passage through which the cooling air flows.

  “Winglet density lateral” is the number of turbulent members, such as embossments, winglets, embossments or indentations of turbulent inserts, per digital meter length.

Indirect exhaust gas heat exchanger:

Exhaust gas cooler (direct):

  The features of the embodiments described above can be arbitrarily combined with each other. The present invention can also be used in fields other than those shown.

1 shows an apparatus for supplying combustion air to an internal combustion engine according to the present invention. 1 shows an apparatus for exchanging heat between a gas containing an acid and a heat exchange medium according to the present invention.

Claims (27)

Combustion air supply to an internal combustion engine having an intake conduit, a compression member, a supercharged air conduit, and a supercharged air cooler with at least one flow passage for supercharged air disposed in the supercharged air conduit In which the combustion air in the intake conduit or in the supercharged air conduit can be mixed with the exhaust gas from the exhaust gas recirculation conduit and then guided through the supercharged air cooler,
Apparatus for supplying combustion air to an internal combustion engine, characterized in that at least one flow passage of the supercharged air cooler consists essentially of aluminum and / or aluminum alloy. In an apparatus for exchanging heat between an acid-containing gas and a heat exchange medium, in particular an exhaust gas cooler and / or a supercharged air cooler, having at least one flow passage for the acid-containing gas,
A device for exchanging heat, characterized in that at least one flow passage for the gas containing acid consists essentially of aluminum and / or an aluminum alloy.   The apparatus according to claim 1, wherein at least one flow passage has a corrosion prevention part inside.   The apparatus according to claim 1, wherein the corrosion prevention part is formed as a coating.   5. A device according to any one of the preceding claims, characterized in that the coating only covers the inside of the flow channel incompletely and in particular has cracks, holes, gaps and the like.   6. A corrosion protection part for the cathode for the area to be protected of the flow passage is provided since the corrosion prevention part has a region which is susceptible to electrochemical oxidation. The apparatus of any one of these.   7. The device according to claim 1, wherein the electrochemical potential difference between the area to be protected and the area susceptible to oxidation is at least 20 mV, in particular at least 50 mV.   The device according to any one of claims 1 to 7, characterized in that the corrosion prevention part is made of a metal and / or an alloy, in particular an aluminum alloy.   At least locally, the surface in contact with the gas containing the acid is covered with a metal that is easily oxidized, a phase that is easily oxidized or a metal that is easily oxidized and / or connected in electrical communication with the area concerned. 9. A device according to any one of the preceding claims, characterized in that   At least one flow path for the acid-containing gas is substantially from a row AA3xxx aluminum alloy, in particular from AA3003 or AA3005, or from a general transformation in the heat transfer structure, or pure aluminum (AA1xxx), in particular From AA 1145 or AA 1050, or from transformations common in heat transfer structures, or from aluminum alloys containing copper in row AA2xxx, or from transformations common in heat transfer structures, or from AA6xxx, in particular AA6063, or heat transfer. 10. A device according to any one of the preceding claims, characterized by a general transformation in body structure. 2. The oxidizable metal is provided with zinc, tin, indium or vanadium, or an oxidizable alloy or phase having zinc, tin, indium and / or vanadium is provided. The apparatus according to any one of 1 to 10.   12. Device according to any one of the preceding claims, characterized in that one or more turbulent inserts and / or one or more fins are provided in at least one flow passage. .   13. A device according to any one of the preceding claims, characterized in that the corrosion protection part is provided as a turbulent insert and / or a fin.   The turbulent insert and / or fin is made of a material that is easily oxidized with respect to the core region to be protected, or is coated with a metal that is easily oxidized, a phase that is easily oxidized or a metal that is easily oxidized. The apparatus according to any one of 1 to 13. The device according to any one of claims 1 to 14,
The turbulent inserts and / or fins consist essentially of an aluminum alloy of the line AA3xxx, in particular containing zinc, or of a general transformation in the heat transfer structure, or an aluminum alloy of the line AA7xxx, in particular AlZn1, An apparatus characterized in that it comprises a general transformation in the heat transfer structure, or consists of an aluminum alloy in the row AA8xxx, in particular AA8006, AA8011, or AA8079, or a transformation common in the heat transfer structure.   Device according to any one of the preceding claims, characterized in that the turbulent inserts and / or fins are made of special steel that is not specifically coated.   17. A device according to any one of the preceding claims, characterized in that the flow channel and / or possibly the turbulent insert or fin has a solder plating.   18. A device according to any one of the preceding claims, characterized in that the corrosion protection part is formed as a flow passage and / or a turbulent insert or fin solder plating.   The apparatus according to any one of claims 1 to 18, wherein the corrosion preventing portion is provided on the solder plating.   The apparatus according to any one of claims 1 to 19, wherein the solder plating is provided on the corrosion prevention portion.   AlSi solder plating is provided, in which case the plating has an element which is easily oxidized, and the silicon content of the solder plating is in the range of 4 to 15% by weight, particularly 5 to 12% by weight. The zinc content is in the range from 0.05 to 10% by weight, in particular from 0.2 to 5% by weight, and the indium, tin and / or vanadium content is in the range from 0.0 to 0.3% by weight. 21. A device according to any one of the preceding claims, characterized in that   The device according to any one of claims 1 to 21, wherein the easily oxidizable element is zinc and / or indium.   A plating is provided, said plating having a substantially constant thickness of 2 to 40%, in particular 2 to 30%, in particular 5 to 20% of the wall thickness of the flow passage, in particular at its thinnest part. 23. A device according to any one of the preceding claims, characterized in that   The apparatus according to any one of claims 1 to 23, wherein the corrosion preventing portion is electrochemically less oxidized than the solder plating.   The apparatus according to any one of claims 1 to 24, wherein the solder plating is electrochemically less oxidized than the corrosion prevention portion.   26. A device according to any one of the preceding claims, characterized in that the device is hard soldered at least partially under vacuum or protective gas, with or without flux.   27. The device according to any one of claims 1 to 26, characterized in that the corrosion protection part is formed as a flux, in particular containing zinc, and the device is at least partially hard soldered.

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